Grain Refinement by Cyclic Displacive Forward/Reverse Transformation in Fe-High-Ni Alloys
Grain Refinement by Cyclic Displacive Forward/Reverse Transformation in Fe-High-Ni Alloys
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DOI：
10.1007/s11661-017-4152-4
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
Tadachika Chiba;H. Shirazi;G. Miyamoto;T. Furuhara
中科院分区：
文献类型：
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作者：
Tadachika Chiba;H. Shirazi;G. Miyamoto;T. Furuhara
提出了一种马氏体组织晶粒细化的新方法，即通过循环位移正向和反向变换积累相变应变。这种方法可以细化Fe-18Ni合金的马氏体组织，因为在循环相变过程中，除了将体心立方马氏体的位错继承到奥氏体之外，位移反向相变还引入了高密度的奥氏体位错。少量碳的加入显著加速了组织细化，10次循环后形成超细晶组织。
A novel method for grain refinement of martensite structures was proposed, in which transformation strain is accumulated by cyclic displacive forward and reverse transformations. This method can refine martensite structures in an Fe-18Ni alloy because a high density of austenite dislocations is introduced by a displacive reverse transformation in addition to an inheritance of dislocations in body-centered cubic martensite into austenite during cyclic transformation. The addition of a small amount of carbon accelerates structure refinement significantly, which results in the formation of ultra-fine-grained structures after ten cycles.